<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <video controls class="handsome"></video>
    <script>
        const video = document.querySelector('.handsome')
        //BOM
        window.navigator.mediaDevices.getUserMedia({video:true , audio:true})
            .then(mediaStream =>{
                video.srcObject = mediaStream;
                video.load()
                video.play()
            })
            .catch(err =>{
                console.log(err);
            })
    </script>
</body>
</html>